EDWARD KINSMAN / SCIENCE PHOTO LIBRARY EDWARD KINSMAN / SCIENCE PHOTO LIBRARY
A thermogram of an elderly womans back. Note how the large vein close to the skins surface is much hotter than the surrounding body. The temperature range goes from hot (white) to cold (blue). Thermography is a technique for visualizing the temperature of surfaces by recording the emission of long-wavelength infrared radiation. This heat radiation is detected electronically and displayed with different colours representing different temperatures.
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